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Even silver that has been fully work-hardened, either by rolling or forging, gradually recrystallizes, even at room temperature. This greatly softens the metal, making it susceptible to scratching and marring. To maintain hardness, therefore, other metals are added to form alloys that are harder, stronger, and less prone to fatigue. The best-known copper-silver alloy is sterling, which is 92.5 percent silver and 7.5 percent copper. (In England sterling silver is traditionally identified by the hallmark of a lion passant.) Coin silver is an alloy of 90 percent silver and 10 percent copper. For jewelry and ornaments, 85-90 percent silver (and the balance copper) is frequently used. Dental alloys of 60-70 percent silver, 18-25 percent tin, 2-14 percent copper, and 0.5-2 percent zinc are amalgamated with varying quantities of mercury to form the filling materials for cavities in teeth. Silver and alloys of silver and copper, although stable in air, tarnish in the presence of sulfur. In order to improve tarnish resistance, up to 40 percent palladium is added. In order to obtain the lustre and corrosion resistance of silver on other metals and alloys, silver electroplating is practiced. Cyanide-based baths are most commonly employed.
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